Fast and easy Shampoo-In Haircolour for a natural grey-free look. Just For Men Shampoo-In Haircolour covers your greys completely, permanently and effectively. It targets only the grey hair and preserves subtle variations of your natural hair colour. This easy to apply hair colour only takes five minutes to restore your original colour, and lasts until the grey grows back. Just For Men Shampoo-In Haircolour contains Keratin, Olive oil & Vitamin E to support strong and fuller, healthier-looking hair. The results are 100% natural looking. Its ammonia free formula causes no damage to your hair, while giving you professional looking results. Can't decide between two shades? Try the lighter one first. You can always go darker later.